It's not just male cats that do this behaviour! Peanut (a spayed female longhaired chihuahua) does this to her stuffed animals. Her favorite one for years, was a stuffed tiny Santa that got quite the workout! It got to the point Santa was so well loved that he was out of stuffing and not much more than a Santa skin. My friend Barbara restuffed and patched poor Santa up, declared him "out of intensive care" lol, and Peanut enjoyed several more loving years with the old guy. He was replaced with an identical one that I finally found after searching high and low, but it wasn't the same old dirty Clause! Her new love is a stuffed "Tom Kitten" from Beatrix Potter...and more life sized for her. Someday....maybe..I'll get some pics of her in love with her kitty.